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Author Question: A decline in the rates of sexual activity for teenagers between 1991 and 2001 was followed by a ... (Read 45 times) |
People who have myopia, or nearsightedness, are not able to see objects at a distance but only up close. It occurs when the cornea is either curved too steeply, the eye is too long, or both. This condition is progressive and worsens with time. More than 100 million people in the United States are nearsighted, but only 20% of those are born with the condition. Diet, eye exercise, drug therapy, and corrective lenses can all help manage nearsightedness.
Blood is approximately twice as thick as water because of the cells and other components found in it.
The heart is located in the center of the chest, with part of it tipped slightly so that it taps against the left side of the chest.
The first oral chemotherapy drug for colon cancer was approved by FDA in 2001.
Vaccines cause herd immunity. If the majority of people in a community have been vaccinated against a disease, an unvaccinated person is less likely to get the disease since others are less likely to become sick from it and spread the disease.